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A brown substance 'X' on heating in air ...

A brown substance 'X' on heating in air forms a substance 'Y'. When hydrogen gas is passed over heated 'Y', it again changes back into 'X'.
(i) Name the substances X and Y.
(ii) Name the chemical processes occurring during both the changes.
(iii) Write the chemical equations.

Text Solution

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(i) `X-Cu,Y-CuO`.
(ii) When copper is heated in air, oxidation take place. When hydrogen gas is passed over heated copper oxide, reduction takes place.
(iii) `2Cu+O_(2)overset(Delta)rarr2CuO` (Oxidation)
`CuO+H_(2)overset(Delta)rarrCu+H_(2)O` (Reduction)
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